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Ecology Notes – Part 2: Cycling of Matter in Ecosystems Biology Spring 2012 Your last meal • List all of the things you consumed during your last meal. • Mrs. Slater’s breakfast = peanut butter granola bar, banana, nonfat milk, iced nonfat vanilla latte • For each item, determine where the materials & energy in that food came from. • Work “backwards” if you ate something that also ate food to live. Mrs. Slater’s Nonfat Milk Skim Milk Product of a cow Sun Minerals (N, P, K, Ca) Grass CO2 H2 O Some of your examples? Mrs. Slater’s Nonfat Milk But where do Skim Milk the materials come from? Product of a cow Sun Minerals (N, P, K, Ca) Grass CO2 H2 O Sources of Materials? • CO ? • Respiration, combustion, decomposition? • H O? • Precipitation, ground water? • Minerals? • Soil, bacteria or fungi breaking things 2 2 down? What about the energy? Skim Milk Heat Product of a cow Sun Grass Metabolism Heat Conclude... • How does energy move through an ecosystem? • Energy flows from sun to chemical bond to cell work to heat • How does material move through an ecosystem? • It is cycled, converted to many forms Simple Summary How does this fit? • What do you remember about the interactions between respiration & photosynthesis? Remember this? Ecosystem Matter Cycles There are 3 cycles of matter that you need to be familiar with… The Carbon Cycle The Nitrogen Cycle The Water Cycle Overview… Energy flows Matter cycles Decomposers are important in the nitrogen and carbon cycles http://www.youtube.com/watch?v=0_c0 ZzZfC8c&feature=results_main&playne xt=1&list=PLE8BD15674EF17038 Remember… Ecosystem: Interaction between abiotic and biotic factors in an environment create an ecosystem Ex: Forest, Desert, Mountains, Ocean Now we have some important abiotic factors (matter) included in the picture & see how they’re related to the biotic factors